I've seen a few people post wanting to know what size goes with what and how it would look like.. well now you can use this.

Basically all you do is enter the original size, and then enter the desired sizes and on the side it shows
a chart comparing the original with the new one with lines. Sort of like the offset calculator you see online
Also note this doesn't show Camber, it's just a Tire Calculation file.

Hope this helps anyone:

Tire Stretch Calculator: Select Tire or Rim Manufacturer from Left Hand Column

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To add on to that:

http://www.willtheyfit.com/

http://www.rimtuck.com/

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yeah, just wanting people to get more resources to help their decisions! :3

 

what about tire pressure though ? how do you calculate the difference ?

going from 17 to 18 inch rim/tire 225.35.17 - 235.35.18 or 235.40.18

 

generally if your gonna be stretching tires your gonna need a little more psi then usual to help keep the beads of the seal tighter.

im running 40-42 psi on 225/35/18 on 18x10